Gold Automatic Dress Watch - Runs Fine But Can Not Wind Up

I recently inherited this  watch from my father. I think he probably purchased it in the 1960s (possibly in Celon/ Sri Lanka in 1962).

If I "charge" it, by wearing it for several hours, and then place it static on a table, it runs for about 50 hours. But I am unable to wind it up manually as the crown will not turn clockwise.

I would greatly appreciate and information on the watch, inputs on why I am unable to manually wind it up, advice on how this might be resolved and whether this is likely to be an expensive repair please.

Many thanks!

Just to clarify. 

If I pull the crown out, I can move the watch hands to set the time. But, with the crown pushed in, I can not turn it clockwise, so am unable to manually wind it.

It seems you posted this twice, I made a response on the other post.

If the watch runs when worn but cannot be manually wound, the winding mechanism is likely worn or blocked. Have a professional watchmaker inspect and service it, as repair costs vary with age and movement type.

Hi Ricardooo.

Thanks for your reply.

I think it's just a question of where best to take it for a service.

I've googled two or three watch repairers in the Denver area that look like they have experience with higher end vintage watch service and repair. I'd be interested if anyone in the forum has experience of any of these?

The best alternative would obviously be to send it  to IWC in Switzerland but it would be pretty expensive for me, and on top of that I'm not sure how Trump Tariffs and customs would impact this.